Device for generating an instruction signal for use in an automatic digital read-out apparatus

ABSTRACT

Device for generating an instruction signal for demanding the digitally measured value of displacement to be transferred from the measuring station to the memory of an automatic digital readout apparatus. The measuring station generates a counting pulse successively each time the displacement reaches a measuring unit so as to be applied to the electronic counter of the automatic digital readout apparatus so that the digitally indicated measured value corresponding to the displacement is generated therein. A detecting pulse is generated when the displacement reaches the desired measuring point thereof, and this detecting pulse is applied to the electronic counter so as to permit the digitally indicated measured value provided therein at the measuring point of the displacement to be transferred to the memory whenever the interference period of the electronic counter elapses, in which interference period the electronic counter can not provide the correct digitally indicated measured value due to the counting operation therein.

United States Patent 72 inventor Shin-lchi Kaniachi 3,296,525 l/l967Sakuma 324/68 Tokyo, Japan mary ExammerMaynard R. WIlbur [2|] P 800335Assistant ExaminerRobert F. Gnuse [22] Med 1969 Attorney-Otto John Munz[45] Patented Feb. 2, 1971 [73] Assignee Olympus Optical Co., Ltd.

. Tokyo, Japan Priority ABSTRACT: Device for generating an instructionsignal for Japan demanding the digitally measured value of displacementto be [3]] 43/12870 transferred from the measurin station to the memo ofan g "y automatic digital readout apparatus. The measuring station 54DEVICE FOR GENERATING AN INSTRUCTION f cmgming pulsefiuccefively 3 "f,Wi SIGNAL FOR USE IN AN AUTOMATIC DIGITAL P es 3 measmng app electromccounter of the automatic digital readout apparatus READ-OUT APPARATUS 3CM 9mm"! s so that the digitally IndIcated measured value correspondingto the displacement is generated therein. A detecting pulse is U.S.generated when the displacement reaches the desired measurll- Cl.thereof and this detecting pulse is to the 21/ 1 2 electronic counter soas to permit the digitally indicated meaof Search... 65, u -ed vah erovided therein at the measuring point of the dis- 73, 74, 29 placementto be transferred to the memory whenever the interference period of theelectronic counter elapses, in which [56] Reierenees cued interferenceperiod the electronic counter can not provide the UNITED STATES PATENTScorrect digitally indicated measured value due to the counting 2,495,0732/ I970 James 235/92 operation therein.

- COUNTING PULSE e I TO ELECTRONIC COUNTER INTERFERENCE P Rm RTERINFORMATION em fgE TING CIRCUIT AND DETECTING CIRCUIT lI PULSE CIRCU- ITFOR GJTPUT pd AND DELAY SIGNAL CIRCUIT I CIRCUIT MEASURING STATIONELECTRONIC COUNTER COUNTING PULSE DETECTING STATION DETECTING PULSEMEMORY I r i- -FL|P FLOP CIRCUIT IN *ELECTRONIC COUNTER READ-OUTINSTRUCTI SIGNAL AND CIRCUIT AND CIRCUIT 0 j I I I ,FLIPFLOP CIRCUIT INI F MEMORY I COUNTING PULSE I I I I I T I T l T TIME REQUIRED FORSHIFT-UP DETECTING PULSE IL [L INVENTOR SHIN-[CHI KAMACHIPATENIEDFEIIEIIITI 3,560,723

SHEET 2 0F 4 CJUNTINO PULsE j o- I TO ELECTRONIC COUNTER INTERFERENCEPERIOD INFORMATION GENERA- 'YQ ES TING CIRCUIT I AND IEE j Q LSHAPINGCIRCU- IT FOR OUTPUT pd AND DELAY S' CIRCUITI CIRCUIT HCOUTING PULsE FLT I'L IL I- OUTPUT OF INTERFERENCE EERESAT'PN E HRSSPT j q I OUTPUT OFINvERTER U CIRCUIT AI-L: n DETECTING PULsE OUTPUT OF AND CIRCUITI H L T-I OUTPUT OF DELAY CIRCUIT. FL

' OUTPUT OFAND CIRCUIT v H v L INVENTOR SHIN-Kill] KAMMIIII OhmPATENTEI] FEB 2I97I COUNTING PULSE H PC SHEET 3 OF 4 INTERFERENCE PERIODTO ELECTRONIC COUNTER COUNTING PULSE OUTPUT OF INVERTER CIRCUITDETECTING PULSE OUTPUT OF CONTINUING SIGNAL GENERATING CIRCUIT OUTPUT OFAND CIRClJIT OUTPUT OF SHAPING CIRCUIT FOR OUTPUT SIGNAL INVERTERINFORMATION GENERA- TING CIRCUIT CIRCUIT DETECTING PUCSTN NuING SIGNAL 0TI I GENERATING CIRCUIT T ANDCIRCUIT ll SHAPING CIRCUIT FOR OUTPUTSIGNAL L I I L If;

I l L I I I I I I I I INVENTOR SHIN-ICU] KAIVIACIII BY ATTORNEY'PATENTED FEB 2 IIITI coUNTI G PULSE -SHEET I [If 4 Fm ELECTRONICCOUNTER INTERFERENCE PERIoD I INFORMATION GENERAT- OR E R ING CIRCUIT TCIRCUIT CIRCUIT DETECTING PULSE- CONTINUING SIGNAL GENERATING CIRCUITSHAPING CIRCUIT FOR OUTPUT SIGNAL INVERTER CIRCUIT TIT INVERTER ILSINGLE-STABLE I I MULTIVI BRATOR DC cIRcUIT CIRCUIT coUNTING PULSE ANDFLIP-FLOP CIRCUIT CIRCUIT IL ,J DIFFERENTIA- DETECTING PULSE TIONCIRCUIT SINGLE STABLE MULTI VI BRATOR CIRCUIT INVENTOR SHIN -I(II I]KAMA( II II DEVICE FOR GENERATING AN INSTRUCTION SIGNAL FOR USE IN ANAUTOMATIC DIGITAL READ-OUT APPARATUS BACKGROUND OF THE INVENTION Thepresent invention relates to a device for generating an instructionsignal for use in an automatic digital readout apparatus and. moreparticularly, to the device of the type described above which canpositively prevent an incorrect digitally indicated measured value of adisplacement from being generated due to the interference period of theelectronic counter of the apparatus, in which interference periodshift-up in the counting process and the like is being carried out inthe electronic counter so that the correct indicated measured value cannot be obtained in the interference period.

Recently, a digital measuring apparatus such as a pulsegeneratingapparatus mounted on the rotating shaft of a lead screw, a length orangle-measuring instrument utilizing Moire fringes, and a digitalvoltmeter and the like has been widely developed. Thesedigital-measuring apparatuses generate in general electric pulses in themeasuring station of the apparatus which are the multiple of themeasuring unit corresponding to the displacement to be measured, andthese electric pulses are utilized as counting pulses which are appliedto the electronic counter of the apparatus so as to effect the counting.Therefore, the measured value is indicated as the numerical value in theindicating station of the electronic counter.

Thus, the troublesome and time consuming procedure required in readingout a scale or a pointer of a measuring instrument heretofore used inthe measurement can be entirely eliminated.

However, even thoughan electronic counter is utilized, the procedure toreadout the digitally indicated measured value appearing in theindicating station of the electronic counter is still required. Such aprocedure is, under particular conditions, very troublesome and timeconsuming.

That is, in order to readout the digitally indicated measured valueappearing in the indicating station of the electronic counter, it isnecessary that the indicated measured value remains unchanged in theindicating station until the readout of the indicated measured value iscompleted, thus necessitating the measuring station to be kept at restin the readout period so that no counting pulses are applied to theelectronic counter.

When the pitch of a lead screw is to be measured by a digital-measuringapparatus, for example, a number of electric pulses proportional to thedisplacement of the table carrying the lead screw thereon whichcorresponds to the pitch of the lead screw are applied to the electroniccounter so as to obtain the digitally indicated measured value of thedisplacement of the lead screw corresponding to one pitch thereof. Inthis case, in order to set the measuring point of the leadscrew, aseparate detector such as a microscope mounted fixedly on the apparatusis provided, and the image of the lead screw is viewed through themicroscope so that the table carrying thereon the lead screw is stoppedeach time successive one of the predetermined points on the lead screwappears at the set point in the field of view of the microscope as thetable is moved.

Therefore, in case a large number of screw threads are to be measuredfor determining the pitch of the lead screw, the procedure for readingout the indicated measured value becomes more troublesome as the numberof the measuring points increases.

For this reason, it is desirable if the measurement such as that fordetermining the pitch of a lead screw can be carried out automaticallyand continuously without stopping the movement of the table carrying thelead screw in case a large number of measuring points must be measured.There are many cases in which it is desired to carry out the measurementcontinuously and automatically because of a large number of themeasuring points to be measured.

Thus, the utility of a digital-measuring apparatus will be extremelyincreased, if the readout procedure of the digitally indicated measuredvalue in the apparatus is not required by fully automating thedigital-measuring apparatus as described above.

in order to achieve the above-described full automation of .theapparatus, there are several processes, in which, for example, thedigitally indicated measured value obtained in the electronic counter istransferred to a separate memory of the apparatus each time themeasurement reaches the desired measuring point, or two electroniccounters are provided which are alternately connected to the electroniccounter for the measurement and the indicated measured value obtainedtherein is transmitted to a separate memory of the apparatus.

To this end, the detector as described previously must be replaced bythe one which'can generate an electric pulse each time the measuredvalue is to be readout.

In the measurement of the pitch of a lead screw as described above, forexample, a photoelectric microscope is used in place of the microscopedescribed above, which photoelectric microscope can generate an electricpulse as the predetermined point in the image of the lead screwappearing in the field of view of the microscope comes in coincidencewith the set point in the field of view.

At the same time, an output circuit is provided in the electroniccounter which can effect the coding of the indicated measured valueobtained in the electronic counter, and an instruction pulse fordemanding the readout of the indicated measured value constructingapplied to the output circuit .thereby permitting the indicated measuredvalue in the electronic counter to be transferred to the memory so as topermit the indicated measured value to be read out from the memory.

Such a procedure can, for example, be carried out by constructing thememory by the same number of flip-flop circuits as that of the flip-flopcircuits constructing the electronic counter and by making therespective flip-flop circuits in the memory correspond to the respectiveones in the electronic counter so as to form the respective pairs of theflip-flop circuits. And the output of each of the flip-flop circuits inthe electronic counter and the readout instruction pulse obtained by thedetecting pulse are applied to an AND circuit and the output of the ANDcircuit is applied to the corresponding flipflop circuit in the memoryforming the pair with the respective flip-flop circuit in the electroniccounter.

Thus, in the case as described above, the detecting pulse is applied tothe output circuit each time the predetermined point in the image comesin coincidence with the set point in the field of view of thephotoelectric microscope used as the detector, so that the indicatedmeasured value appearing in the electronic counter at the time theread-out instruction pulse is applied to the output circuit istransferred to the memory through the output circuit thereby permittingthe thus transferred indicated measured value in the memory to be keptunchanged until the next detecting pulse is applied to the outputcircuit. Therefore, the measurement can be effected automatically andcompletely continuously.

The above-described apparatus in which the condition existing in anelectronic circuit is successively transferred to another electroniccircuit by a detecting pulse so as to be, stored therein can be easilyconstructed by well-known technique. However, serious problems arise insuch an apparatus by merely constructing the same as described above. Inother words, by such a construction of the apparatus, possibility of thefaulty function of the apparatus cannot be avoided.

That is, when the digitally indicated measured value in the electroniccounter is transferred to the memory by means of the detecting pulse,the indicated measured value in the electronic counter must be keptunchanged during a certain time period, even though it is very short, inorder to correctly transfer the indicated measured value to the memory.However, the digitally indicated measured value in the electroniccounter comprises in general a plurality of numerals, and a time period,even though it is very short, is required for shifting up of thenumerals in the digitally indicated measured value in order to set thecorrect indicated value. Therefore. a certain time period is requireduntil the correct indicated value is obtained and kept unchanged afterthe counting pulse is applied to the electronic counter.

In such a time period required for obtaining the correct indicated valueafter the application of the counting pulse to the electric counter, theindicated measured value in the electronic counter will not always becorrect. Therefore, should the detecting pulse be applied to the outputcircuit in such a very limited time period, there might occur a dangerthat the digitally indicated measured value transferred to the memory isincorrect. The time period referred to above will be called theinterference period of the electronic counter hereinafter.

The present invention aims at avoiding the above-described disadvantagesand providing a novel and useful device for generating an instructionsignal for use in an automatic digital readout apparatus which canproperly transfer the indicated measured value from the electroniccounter to the memory of the apparatus by applying the readoutinstruction signal even though the same is applied to the electroniccounter within the interference period thereof.

SUMMARY OF THE INVENTION An object of the present invention is toprovide a novel and useful device for generating an instruction signalfor use on an automatic digital readout apparatus utilizing countingpulses generated in response to a displacement to be measured, whichdevice can properly transfer the digitally indicated measured valueobtained in the electronic counter of the apparatus in response to thedisplacement to be measured to the memory of the apparatus by means ofthe readout instruction signal derived from a detecting pulse generatedat the measuring point of the displacement.

Another object of the present invention is to provide a novel and usefuldevice of the type described above, which can properly transfer thedigitally indicated measured value obtained in the electronic counter tothe memory even though the detecting pulse is applied to the electroniccounter within the interference period thereof.

In accordance with the present invention, the application of the readoutinstruction signal derived from the detecting pulse, which is generatedat the measuring point of the displacement, to the output circuit of theelectronic counter can be positively delayed until the interferenceperiod elapses. When the detecting pulse is generated within theinterference period, whereas, when the detecting pulse is generatedafter the interference period elapses, the readout instruction signal isapplied to the electronic counter simultaneously with the generation ofthe detecting pulse. Thus, the faulty function of the automatic digitalreadout apparatus can be positively avoided thereby permitting theapparatus to be used widely in various applications.

As previously described, in an automatic digital readout apparatus, whenthe measuring station thereof is not at rest, the counting pulses aresuccessively applied to the electronic counter, while the countingpulses are not applied to the electronic counter when the measuringstation is at rest, and a certain time period referred to above as theinterference period is required until the shifting up of the numerals ofthe indicated measured value is completed in the electronic counter andthe electronic counter assumes the steady rate indicating the correctdigitally indicated measured value in response to the particularcounting pulse applied to the electronic counter after the applicationof the same to the electronic counter.

Therefore, if the detecting pulse is generated within the interferenceperiod, the application of the readout instruction signal derived fromthe detecting pulseto the output circuit of the electronic counter mustbe delayed after the interference period elapses. On the other hand, ifthe detecting pulse is generated after the interference period elapses,the readout instruction signal derived from the detecting pulse may beapplied to the output of the electronic counter simultaneously with thegeneration of the detecting pulse.

Therefore, the present invention provides a novel and effective devicefor generating the readout instruction signal efficiently used in theautomatic digital readout apparatus of the type described above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a block diagram showing thegeneral type of an automatic digital readout apparatus utilizing anelectronic counter;

FIG. 2 is a block diagram exemplarily showing the general type of thecircuit for transferring the digitally indicated measured value obtainedin the electronic counter to the memory of the apparatus;

FIG. 3 is a diagrammatical view showing the possibility of occurrence offaulty functions depending upon the time relationship between thecounting pulse and the detecting pulse in the operation of the automaticdigital readout apparatus of the pIIOI' art;

FIG. 4 is a block diagram showing an embodiment of the instruction ofthe device for automatically generating the readout instruction signalconstructed in accordance with the present invention which can eliminateentirely the faulty functions;

FIG. 5 shows a time chart showing the principle of the operation of thedevice of FIG. 4;

FIG. 6 is a block diagram exemplarily showing a modification of FIG. 4;

, FIG. 7 shows a time chart showing the principle of the operation ofthe device of FIG. 6;

FIG. 8 is a block diagram showing a further modification of the deviceshown in FIG. 4; and

FIG. 9 is a diagrammatical view showing the circuitry embodying thedevice shown in FIG. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to thedescription of the present invention prior art automatic digital readoutapparatus will be briefly described for the better understanding of thepresent invention.

In FIG. 1, the electronic counter is provided with an output circuitwhich can effect the coding of the digitally indicated measured valuegenerated in the electronic counter in response to the counting pulsessupplied thereto from the measuring station, the counting pulses beinggenerated in the measuring station in proportion to the displacement tobe detected as described previously. A detecting pulse is generated inthe detecting station when the displacement reaches the desiredmeasuring point thereof and this detecting pulse is applied to theoutput circuit from the detecting station, so that the content of theelectronic counter is transferred to the memory so as to be readouttherefrom.

The memory comprises the same number of flip-flop circuits as that ofthe flip-flop circuits in the electronic counter and each of theflip-flop circuits in the memory is combined with the respective matingflip-flop circuit in the electronic counter so as to form the respectivepair as shown in FIG. 2. An AND circuit is provided between theflip-flop circuits forming the pair as shown, to which the detectingsignal, i.e. the readout instruction signal in this case is applied sothat the output of the AND circuit is applied to the flip-flop circuitin the memory. Thus, each time the readout instruction signal is appliedto the AND circuit, the indicated measured value generated in theelectronic counter is transferred to the memory by means of each of thepairs of the flip-flop circuit as shown in FIG. 2, and the thustransferred indicated measured value is kept unchanged until the nextinstruction signal is applied to the AND circuit so as to facilitate thereadout of the indicated measured value from the memory.

Thus, the correct indicated measured value can be transferred to thememory insofar as the readout instruction signal is applied to the ANDcircuit after the interference period T of the electronic counterelapses'a s indicated by A in FIG. 3. However, if the readoutinstruction signal is applied to the AND circuit within the interferenceperiod T of the electronic counter as indicated'by B in FIG. 3, thereis.a possibility that the correct indicated measured'value might not betransferred to the memory for the reason previously described.

The present invention provides a device for generating a readoutinstruction-signal in an automatic digital readout apparatus which canpositivelyprcvent the readout instruction signal derived from thedetecting signal from being supplied to the output circuit of theelectronic counter until the interference period thereof elapses afterthe application of the counting pulse to the electronic counter. Thus,an automatic digital readout apparatus can be freely used broadly invarious applications in accordance with the present invention.

Now, the embodiments of the present invention will be described inconnection with the drawings.

In FIG. 4 showing the embodiment of the present invention,

. counting pulses PC are applied to an interference period inforvertedinterference period information from the inverter circuit to an ANDcircuit II. On the other hand, the detecting pulse Pd is adapted to beapplied to the AND circuit II, so that, when the detecting pulse Pd isapplied thereto after the output of the interference period informationgenerating circuit is extinguished, i.e. after the interference period Telapses after t the interference period T elapses after the applicationof the particular counting pulse PC to the interference periodinformation generating circuit as indicated by B in FIG. 5, the ANDcircuit II generates an output, because it'receives the inverted theoutput of the inverter circuit appears as shown, which is the inversionof the output of the interference period information generating circuit.

Now, should the detecting pulse Pd be applied .to the device at a timewithin the interference period T as indicated by A in FIG. 5, then theAND circuit I generates an output while the AND circuit II is keptinoperative, because the inverter circuit is interposed between theinterference period information generating circuit and the AND circuitII. Thus, the output to be applied to the shaping circuit is suppliedfrom the AND circuit I and the output is delayed by the delay period Tof the the AND circuit II is applied to the shaping circuit for theoutput of the interference period information generating circuit fromthe inverter circuit, thereby permitting the output of the AND circuitII to be applied to ashapingcircuit for the output signal connectedthereto. Thus, the output of the shapconnected thereto which'hasa delaytime T longer than the. interference period T. The delay circuit is alsoconnected to the shaping circuit so as to apply the output of the delaycircuit to the shaping circuit.

Thus,.-when the detecting pulse Pd is applied'to the AND circuit Iwithin the interference period after application of the counting pulsePC to the, interference period information generating circuit, the ANDcircuit I is actuated so that the output thereof is applied to the delaycircuit thereby permitting the output thereof which is delayed bythetime T from the output of the AND circuit I to be applied to the shapingcircuit. Therefore, the output of the shaping circuit can be used as thereadout instruction signal without causing any faulty function of theelectronic counter, because the output of the shaping circuit is delayedby the time T' which is longer than the interference period T from theapplication of the detecting pulse Pd by means of thedelay circuit. Atthe time either one of the AND circuits l and II is actuated, the otherof the AND circuits is not actuated by virtue of the provisions of theinverter circuit.

The operation of the above-described device is fully understood by thetime chart shown in FIG. 5. When the counting pulse PC appears as shownin the drawing, the output of the interference period informationgenerating circuit is generated as shown, the duration of which outputis T beginning at the application of the counting pulse PC, whilereadout instruction signal. Since the detecting pulse Pd is appliedafter the interference period T has elapsed, no interference occursbetween the counting operation to be carried out in the electroniccounter and the readout instruction signal applied thereto.

FIG. 6 shows a modification of the device shown in FIG. 4. In the deviceshown in FIG. 6, a continuing signal generating circuit is used in placeof the AND circuit I and the delay circuit own in FIG. 4. The continuingsignal generating circuit is adapted to receive the detecting pulse Pdas shown and generates'a continuing signal having the duration T longerthan the interference period T when it receives the detecting pulse Pd.The continuing signal generating circuit is connected to an AND circuitII which receives the inverted output of the interference periodinformation generating circuit in like manner as in the case of FIG. 4.The AND circuit II is connected to a shaping circuit for the readoutinstruction signal similar to that shown in FIG. 4.

In the device shown in FIG. 6, there is a restriction that the time atwhich the continuing signal generated inthe continuing signal generatingcircuit upon application of the detecting pulse Pd thereto isextinguished must be the time at which no output of the interferenceperiod information generating circuit exists. To this end, thecontinuing period T" of the output of the continuing signal-generatingcircuit must be made greater than the interference period T of theelectronic counter, or the continuing signal is extinguished after anoutput appears in the AND circuit Il e to the nonexistence of the outputof the interference period information generating circuit.v

The operation of the device of FIG. 6 is best understood by the timechart shown in FIG. 7.

. When the counting pulse PC appears as shown in FIG. 7, the output eachof the interference period information generating circuit and theinverter circuit is generated as shown.

If the detecting pulse Pd is applied within the interference period T asshown in FIG 7, a continuing signal T" is generated by the continuingsignal-generating circuit. Since the time period T" is greater than thetime period T, the output of the interference period informationgenerating circuit does not exist at the time at which the continuingsignal of the continuing signal-generating circuit extinguishes.Therefore, an output is generated by the inverter circuit when thecontinuing signal T" extinguishes, thereby generating an output in theAND circuit II. Thus, the shaping circuit produces the readoutinstruction signal so as to demand the transfer of the indicatedmeasured value generated in the electronic counter to the memory withoutcausing any faulty function of the electronic counter.

If the detecting pulse Pd is applied to the device when the interferenceperiod information T does not exist, the AND circuit II' is immediatelyoperated to produce the output thereof by virtue of the provision of theinverter circuit.

FIG. 8 shows a further modification of the device of HO. 6. The circuitshown in H6. 8 is substantially similar in function to the circuit shownin FIG. 6.

The mutual conversion of the circuit between those shown in FIGS. 6 and8 can be effected by the principle of the logic function indicatedbelow.

(lnteFference period information) (Continuing signal information ofdetecting pulse) (lntefierence perlod informafio n) V(lnverted output ofcontinuing signal information) in FIG. 8, an OR circuit is connected tothe interference period information generating circuit and the invertedoutput of the continuing signal-generating circuit is applied to the ORcircuit. Another inverter circuit is connected to the OR circuit and theoutput of this inverter circuit is applied to the shaping circuit forthe readout instruction signal. The operation of the circuit of HO. 8will be apparent from the above description.

FIG. 9 shows an embodiment of FIG. 6. In this embodiment, a monostablemultivibrator circuit is used as the interference period informationgenerating circuit so as to generate a rectangular wave continuing forthe time period T upon receipt of a counting pulse as the output. Thisoutput of the monostable multivibrator circuit is applied to theinverter circuit so as to produce the inverted output.

On the other hand, a flip-flop circuit is used as the continuingsignal-generating circuit, which flip-flop circuit receives thedetecting pulse so as to generate an output.

Both the above outputs are applied to an AND circuit as shown, so thatthe output of the AND circuit is fed back to the flip-flop circuitthereby permitting the same to be reset while a differentiation circuitconnected to the AND circuit is actuated by the output of the ANDcircuit so that the peak of the output of the differentiation circuitactuates another monostable multivibrator circuit connected thereto. Theoutput of this monostable multivibrator circuit is used as the readoutinstruction signal.

As described above, the present invention can be broadly used in variousapplications, for example, in the case in which the computation iscarried out between two electronic counters which are being operatedwithout any faulty function caused by the interference period of each ofthe electronic counters, such as in the case in which the interferenceof an electronic counter is avoided when the indicated measured value inthe electronic counter which is being operated is added to or subtractedfrom another indicated measured value stored in a separate register.

lclaim:

1. Device for generating an instruction signal for use in an automaticdigital readout apparatus of the measured value relating to thedisplacement at the measuring point thereof, in which a counting pulseis successively generated each time the displacement reaches a measuringunit, and the thus generated pulses are applied to the electroniccounter of said apparatus so as to provide the digitally indicatedmeasured value corresponding to the displacement while the thus provideddigitally indicated measured value is transferred to the memory of saidapparatus by means of a detecting pulse generated when the displacementis at said measuring point thereof thereby permitting said digitallyindicated measured value at said measuring point to be stored in saidmemory, wherein the improvement comprises an interference periodinformation generating circuit adapted to receive said counting pulse soas to maintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, an AND circuit adapted toreceive the inverted outputof said interference period information generating circuit, and acontinuing signal-generating circuit adapted to receive said detectingpulse so as to generate a continuing signal which is maintained untilthe output of said interference period information generating circuit isextinguished, the output of said continuing signal-generating circuitbeing applied to said AND circuit thereby permitting said instructionsignal for demanding the transfer of said digitally indicated measuredvalue at said measuring point from said electronic counter to saidmemory to be delayed until after said interference period elapses whensaid detecting pulse is applied to said continuing signal-generatingcircuit within said interference period whereas said instruction signalis applied simultaneously with the application of said detecting pulseto said continuing signal-generating circuit when said detecting pulseis applied thereto after said interference period elapses.

2. Device for generating an instruction signal for use in an automaticdigital readout apparatus of the measured value relating to thedisplacement at the measuring point thereof, in which a counting pulseis successively generated each time the displacement exceeds a measuringunit, and the thus generated pulses are applied to the electroniccounter of said apparatus so as to provide the digitally indicatedmeasured value corresponding to the displacement, while the thusprovided digitally indicated measured value is transferred to the memoryof said apparatus by means of a detecting pulse generated when thedisplacement is at said measuring point thereof thereby permitting saiddigitally indicated measured value at said measuring point to be storedin said memory, wherein the improvement comprises an interference periodinformation generating circuit adapted to receive said counting pulse soas to maintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, a first AND circuit adapted to receive the output ofsaid interference period information generating circuit and saiddetecting pulse so as to provide an output to be applied to a delaycircuit by which the output thereof is delayed from the input thereof bya time period longer than said interference period, and a second ANDcircuit adapted to receive the inverted output of said interferenceperiod information generating circuit and said detecting pulse, therebypermitting said instruction signal for demanding the transfer of saiddigitally indicated measured value at said measuring point to saidmemory to be obtained by the output of said delay circuit or the outputof said second AND circuit after said interference period elapses, theapplication of said instruction signal being delayed until after saidinterference period elapses when said detecting pulse is applied withinsaid interference period, whereas said instruction signal is appliedsimultaneously with the application of said detecting pulse when saiddetecting pulse is applied after said interference period elapses.

3. Device for generating an instruction signal for use in an automaticdigital readout apparatus of the measured value relating to thedisplacement at the measuring point thereof, in which a counting pulseis successively generated each time the displacement exceeds a measuringunit, and the thus generated pulses are applied to the electroniccounter of said apparatus so as to provide the digitally indicatedmeasured value corresponding to the displacement, while the thusprovided digitally indicated measured value is transferred to the memoryof said apparatus by means of a detecting pulse generated when thedisplacement is at said measuring point thereof thereby permitting saiddigitally indicated measured value at said measuring point to be storedin said memory, wherein the improvement comprises an interference periodinformation generating circuit adapted to receive said counting pulse soas to maintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, an OR circuit adapted to receive the output of saidinterference period information generating circuit so as to apply theoutput thereof to an inverter circuit, and a continuingsignal-generating circuit adapted to receive said detecting pulse so asto generate a continuing signal which is maintained until the output ofsaid interference period information generating circuit is extinguished,the inverted output of said continuing signalgenerating circuit beingapplied to said OR circuit thereby permitting said instruction signaldemanding the transfer of said digitally indicated measured value atsaid measuring point to said memory to be obtained by the output of saidinverter circuit after said interference period elapses, the application

1. Device for generating an instruction signal for use in an automaticdigital readout apparatus of the measured value relating to thedisplacement at the measuring point thereof, in which a counting pulseis successively generated each time the displacement reaches a measuringunit, and the thus generated pulses are applied to the electroniccounter of said apparatus so as to provide the digitally indicatedmeasured value corresponding to the displacement while the thus provideddigitally indicated measured value is transferred to the memory of saidapparatus by means of a detecting pulse generated when the displacementis at said measuring point thereof thereby permitting said digitallyindicated measured value at said measuring point to be stored in saidmemory, wherein the improvement comprises an interference periodinformation generating circuit adapted to receive said counting pulse soas to maintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, an AND circuit adapted to receive the inverted outputof said interference period information generating circuit, and acontinuing signalgenerating circuit adapted to receive said detectingpulse so as to generate a continuing signal which is maintained untilthe output of said interference period information generating circuit isextinguished, the output of said continuing signal-generating circuitbeing applied to said AND circuit thereby permitting said instructionsignal for demanding the transfer of said digitally indicated measuredvalue at said measuring point from said electronic counter to saidmemory to be delayed until after said interference period elapses whensaid detecting pulse is applied to said continuing signal-generatingcircuit within said interference period whereas said instruction signalis applied simultaneously with the application of said detecting pulseto said continuing signal-generating circuit when said detecting pulseis applied thereto after said interference period elapses.
 2. Device forgenerating an instruction signal for use in an automatic digital readoutapparatus of the measured value relating to the displacement at themeasuring point thereof, in which a counting pulse is successivelygenerated each time the displacement exceeds a measuring unit, and thethus generated pulses are applied to the electronic counter of saidapparatus so as to provide the digitally indicated measured valuecorresponding to the displacement, while the thus provided digitallyindicated measured value is transferred to the memory of said apparatusby means of a detecting pulse geNerated when the displacement is at saidmeasuring point thereof thereby permitting said digitally indicatedmeasured value at said measuring point to be stored in said memory,wherein the improvement comprises an interference period informationgenerating circuit adapted to receive said counting pulse so as tomaintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, a first AND circuit adapted to receive the output ofsaid interference period information generating circuit and saiddetecting pulse so as to provide an output to be applied to a delaycircuit by which the output thereof is delayed from the input thereof bya time period longer than said interference period, and a second ANDcircuit adapted to receive the inverted output of said interferenceperiod information generating circuit and said detecting pulse, therebypermitting said instruction signal for demanding the transfer of saiddigitally indicated measured value at said measuring point to saidmemory to be obtained by the output of said delay circuit or the outputof said second AND circuit after said interference period elapses, theapplication of said instruction signal being delayed until after saidinterference period elapses when said detecting pulse is applied withinsaid interference period, whereas said instruction signal is appliedsimultaneously with the application of said detecting pulse when saiddetecting pulse is applied after said interference period elapses. 3.Device for generating an instruction signal for use in an automaticdigital readout apparatus of the measured value relating to thedisplacement at the measuring point thereof, in which a counting pulseis successively generated each time the displacement exceeds a measuringunit, and the thus generated pulses are applied to the electroniccounter of said apparatus so as to provide the digitally indicatedmeasured value corresponding to the displacement, while the thusprovided digitally indicated measured value is transferred to the memoryof said apparatus by means of a detecting pulse generated when thedisplacement is at said measuring point thereof thereby permitting saiddigitally indicated measured value at said measuring point to be storedin said memory, wherein the improvement comprises an interference periodinformation generating circuit adapted to receive said counting pulse soas to maintain an interference period information for a time periodcorresponding to the interference period in said electronic counter, inwhich interference period a correct digitally indicated measured valuecan not be obtained by said electronic counter due to the countingoperation thereof, an OR circuit adapted to receive the output of saidinterference period information generating circuit so as to apply theoutput thereof to an inverter circuit, and a continuingsignal-generating circuit adapted to receive said detecting pulse so asto generate a continuing signal which is maintained until the output ofsaid interference period information generating circuit is extinguished,the inverted output of said continuing signal-generating circuit beingapplied to said OR circuit thereby permitting said instruction signaldemanding the transfer of said digitally indicated measured value atsaid measuring point to said memory to be obtained by the output of saidinverter circuit after said interference period elapses, the applicationof said instruction signal being delayed until after said interferenceperiod elapses when said detecting pulse is applied within saidinterference period, whereas said instruction signal is appliedsimultaneously with the application of said detecting pulse when saiddetecting pulse is applied after said interference period elapses.